Microsoft has allegedly confirmed the existence of an 802.11n adapter for the Xbox 360, according to Joystiq. The accessory was recently spotted in FCC documents, leading to speculation that the company is ready to replace the current 802.11a/b/g model. Microsoft did not provide many details, although it referenced the accessory as "another choice to consumers." The choice of words suggests that the 802.11n adapter may be sold alongside the older model instead of serving as a replacement....